Isnt a '13 GTR a 125mph trap car? M5 traps 120 from last I heard.. In the video there about even until high speeds where the M5 seems to have more steam, but then again ive heard the GTR top end speed isn't great.

Doesn't really make sense talking trap speeds wise, on those lower rolls that the M5 is ahead. I would say that M5 is modded.

///M5 LCI
"It's like the F10 is the 911 Turbo to the E60's GT3" -Pistonheads (M5 feature)

All these M5 videos showing them beating out GTR's and there is still doubt. Pretty sure the new M5 is seriously just that fast once it gets rolling. That low end torque sure as hell showed its worth giving the M5 the jump every time. I seriously believe the M5 is just that fast. IF it does have any mods, probably nothing more than some K&n filters.